We performed a TEM study of regeneration of the intestine in the Far Eastern trepang, the holothurian Apostichopus japonicus, after evisceration. The following stages were distinguished in the restoration process of the digestive tube: the growth of connective tissue along the margin of the mesenterium, in the place of rupture; dedifferentiation of cells and their migration and proliferation; the rooting of the esophagus lining into the connective tissue anlage; and the transformation of esophagus cells into cells of the middle part of the intestine. The migration of epithelium into the area of regeneration takes place through a solid cellular layer, without breaking of the cell contacts. The mitotic activity was registered in all stages of restoration; the dividing cells were located chaotically, without the development of a blastema.
Russian Journal of Marine Biology – Springer Journals
Published: Oct 16, 2004
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